The European Commission, which initiates legislation and serves as the executive branch for the European Union, has been asked to step up the development of digital cinema on the continent. European film groups from each of the EU’s 25 countries said in a joint petition to the EC on Wednesday that, given the U.S.’s accelerating transition to high-definition digital exhibition and on-demand cable platforms, “there is a real risk that European films lose out and never reach a new and committed audience.”